NEW Wolf Tooth Elliptical Shimano 110 Asymmetric BCD Chainring 40t, 110 Asymmetric BCD, 4 Bolt, Drop Stop, For Shimano Cranks, Black price_changed_on_2023 12 15 Crank arms forged from 7050 Color:Roarange Crank arms forged from 7050 aluminum with a bracing matrix for added stiffness Color Black Defined Color Black Gender Age Men's Pad Type Foam Protection Area Shin Size One Size Its proprietary design has an ovality of 10% and a timing of 112 degrees after top dead center which provide the beneifits of an oval ring such as greater rear wheel traction without the traditional downsides of oval rings Use of a clutch style rear derailleur is recommended